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GooCanvas Reference Manual | ![]() |
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GooCanvasPolyline; GooCanvasItem* goo_canvas_polyline_new (GooCanvasItem *parent, gboolean close_path, gint num_points, ...); GooCanvasItem* goo_canvas_polyline_new_line (GooCanvasItem *parent, gdouble x1, gdouble y1, gdouble x2, gdouble y2, ...);
"arrow-length" gdouble : Read / Write "arrow-tip-length" gdouble : Read / Write "arrow-width" gdouble : Read / Write "close-path" gboolean : Read / Write "end-arrow" gboolean : Read / Write "height" gdouble : Read / Write "points" GooCanvasPoints : Read / Write "start-arrow" gboolean : Read / Write "width" gdouble : Read / Write "x" gdouble : Read / Write "y" gdouble : Read / Write
GooCanvasPolyline represents a polyline item, which is a series of one or more lines, with optional arrows at either end.
It is a subclass of GooCanvasItemSimple and so inherits all of the style properties such as "stroke-color", "fill-color" and "line-width".
It also implements the GooCanvasItem interface, so you can use the
GooCanvasItem functions such as goo_canvas_item_raise()
and
goo_canvas_item_rotate()
.
To create a GooCanvasPolyline use goo_canvas_polyline_new()
, or
goo_canvas_polyline_new_line()
for a simple line between two points.
To get or set the properties of an existing GooCanvasPolyline, use
g_object_get()
and g_object_set()
.
typedef struct _GooCanvasPolyline GooCanvasPolyline;
The GooCanvasPolyline struct contains private data only.
GooCanvasItem* goo_canvas_polyline_new (GooCanvasItem *parent, gboolean close_path, gint num_points, ...);
Creates a new polyline item.
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the parent item, or NULL . If a parent is specified, it will assume
ownership of the item, and the item will automatically be freed when it is
removed from the parent. Otherwise call g_object_unref() to free it.
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if the last point should be connected to the first. |
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the number of points in the polyline. |
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the pairs of coordinates for each point in the line, followed by
optional pairs of property names and values, and a terminating NULL .
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Returns : |
a new polyline item. |
Here's an example showing how to create a filled triangle with vertices at (100,100), (300,100), and (200,300).
GooCanvasItem *polyline = goo_canvas_polyline_new (mygroup, TRUE, 3, 100.0, 100.0, 300.0, 100.0, 200.0, 300.0, "stroke-color", "red", "line-width", 5.0, "fill-color", "blue", NULL);
GooCanvasItem* goo_canvas_polyline_new_line (GooCanvasItem *parent, gdouble x1, gdouble y1, gdouble x2, gdouble y2, ...);
Creates a new polyline item with a single line.
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the parent item, or NULL .
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the x coordinate of the start of the line. |
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the y coordinate of the start of the line. |
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the x coordinate of the end of the line. |
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the y coordinate of the end of the line. |
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optional pairs of property names and values, and a terminating NULL .
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Returns : |
a new polyline item. |
Here's an example showing how to create a line from (100,100) to (300,300).
GooCanvasItem *polyline = goo_canvas_polyline_new_line (mygroup, 100.0, 100.0, 300.0, 300.0, "stroke-color", "red", "line-width", 5.0, NULL);
"arrow-length"
property"arrow-length" gdouble : Read / Write
The length of the arrows, as a multiple of the line width.
Allowed values: >= 0
Default value: 5
"arrow-tip-length"
property"arrow-tip-length" gdouble : Read / Write
The length of the arrow tip, as a multiple of the line width.
Allowed values: >= 0
Default value: 4
"arrow-width"
property"arrow-width" gdouble : Read / Write
The width of the arrows, as a multiple of the line width.
Allowed values: >= 0
Default value: 4
"close-path"
property"close-path" gboolean : Read / Write
If the last point should be connected to the first.
Default value: FALSE
"end-arrow"
property"end-arrow" gboolean : Read / Write
If an arrow should be displayed at the end of the polyline.
Default value: FALSE
"height"
property"height" gdouble : Read / Write
The height of the polyline.
Allowed values: >= 0
Default value: 0
"start-arrow"
property"start-arrow" gboolean : Read / Write
If an arrow should be displayed at the start of the polyline.
Default value: FALSE
"width"
property"width" gdouble : Read / Write
The width of the polyline.
Allowed values: >= 0
Default value: 0
"x"
property"x" gdouble : Read / Write
The x coordinate of the left-most point of the polyline.
Default value: 0
"y"
property"y" gdouble : Read / Write
The y coordinate of the top-most point of the polyline.
Default value: 0